The collapse analysis of pipes is important in a number of
industries, and notably in the offshore oil and
gas industry. Such simulations
are, in general, difficult because the kinematic large displacement/large strain
behavior of the pipe and the large strain elasto-plastic material
behavior need to be modeled accurately. The analysis must yield
reliably accurate results because many
important engineering decisions depend on the predicted response.

Since the accuracy of the simulation is very important, the required
level of confidence in using a finite element code is best achieved
by comparing computed results against experimental data, for
some typical pipe structures.

Below we present some results obtained by Tenaris, see
reference [1], in laboratory tests and using ADINA. In this case, a pipe
stiffened by a ring (an "arrestor" of buckling) was considered. The figures are
largely self-explanatory. The movie above shows a typical collapse response
as the pressure on the pipe is increased.

First tested sample

First tested sample — finite element mesh

First tested sample — ADINA results compared to experimental results

Second tested sample, with groove

Second tested sample — finite element mesh

Second tested sample — ADINA results compared to experimental results

It is seen that ADINA very accurately predicts the test data. This
is an excellent validation of the analysis procedures used in
ADINA. More information on the analysis is given in the reference.